The Veil Nebula is a supernova remnant located in the constellation Cygnus. It is a very large object in our skies, spanning an area of about six full moons, but it is not visible to the naked eye. (I have heard that it is barely visible in exceptionally dark skies, though.)
The Eastern Veil is one of the brighter sections. The Western Veil is also relatively bright.
|NGC 6992/6995, The Eastern Veil Nebula; ST80 on Vixen SP; Canon EOS Rebel T3; 11x120 @ ISO-3200|
For a detailed view of the entire Veil Complex, see Don Taylor's web site.